A review study on thermal stability of powder-based additively manufactured alloys

Investigation of powder-based additive manufacturing (AM) of metallic alloys is quickly increasing due to reduced defects, low cost, and high efficiency. Recent developments in the printing of defect-free sections promise fundamental motion beyond conventional technologies and also enable the production of complex parts by adding material layer upon layer. Fabricated parts by additive manufacturing have notable mechanical properties owing to the experienced thermal gradient and high cooling rate compared with conventional pro-cesses. Thermal stability, determining the material's ability to keep its properties and sustain at desired tem-peratures over prolonged service time, is becoming the next limiting factor for AM-built metallic alloys. The development of thermally stable materials will provide a wider temperature range for structural applications, particularly in the automotive and aerospace industries. In this review, the previous studies have been pur-posefully collected to survey the high-temperature mechanical properties and thermal stability of metallic alloys fabricated with AM. We explored and discussed the thermal stability of five categories of metallic alloys (aluminum alloys, ferrous alloys, titanium alloys, superalloys, and high entropy alloys) fabricated by various methods of additive manufacturing technology. We emphasized their phase transformation, microstructure development during solidification, and various strengthening mechanisms activated at high and low tempera-tures, all of which affecting on high-temperature mechanical properties. The main goal of this article is to develop an ample comprehension of the mechanical properties and thermal stability of the metallic alloys AM -built under various conditions.